i took the power supply of out my comp and put it in another and then i put that same power supply back into my comp and now im having probs with comp.when i turn it on the hard drive wont turn on, so i then check the power supply and everything on it works fine. i then take the gray ribbon cable from my hard drive and detach it, leaving the hd only with a power cord. now if i turn it on i hear the hard drive turn on.someone told me that by doing what i did with the power supply that i inadverdantly fried my motherboard. is this true, if not then what is wrong with my compy?